H3C MSR Series Troubleshooting Manual page 17

of the DC power supply is well grounded in DC power supply output of the DC power supply
cabinet. Otherwise, submit the rectification requirements to the customer as soon as possible.
Figure 5 Grounding using the PGND wire of the DC power supply cabinet
Grounding strips are not provided and the grounding conductor can be buried in the earth in the
installation environment
If no grounding strips are provided and earth is available at the installation site, hammer a 0.5 m
(1.64 ft) or longer angle iron or steel tube into the earth to serve as a grounding conductor. The cross
section of the angle iron must be no smaller than L×W×H = 50×50×5 mm, and the thickness of the
steel tube must be no smaller than 3.5mm. Galvanized steel is required. Weld the yellow-green
grounding cable to the angel iron or steel tube and treat the joint for corrosion protection. The
sectional area of the grounding cable must be no smaller than 4mm2. Make sure the cable is as short
as possible, and do not twist the cable, as shown in
Figure 6 Grounding when the grounding conductor can be buried in the earth
NOTE:
Method 3 is simple, and the ground resistance might be very high. Use method 3 only when method
1 or method 2 cannot be used.
Figure 6.
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